<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>颜色_第3种表示_HEX或HEXA</title>
    <style>
      /* hexa 后面跟着透明度 00 和 ff ，如果前三位简写了，你后面透明度也需要简写 */
      .atguigu {
        color: #87ceeb2f;
      }
    </style>
  </head>
  <body>
    <h2 class="atguigu">尚硅谷</h2>
  </body>
</html>

<script>
  let a = 10;
  console.log(a.toString(2));
</script>
